QTR-HD-15RC Reflectance Sensor Array Logic Analyzer External application power supply: 3

External application power supply: 3 V and 5 V

User's Guide

If you want to use this version with the Raspberry Pi

better resolution and range

QTR-HD-15RC Reflectance Sensor Array Logic Analyzer External application power supply: 3This array of IR LED phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2. 9 V to 5. 5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high reflectance objects are generally detectable out to around 50mm.